15 astounding facts about Monaco, the tiny French Riviera city-state where 32% of the population is made up of millionaires

Central Park is about 840 acres or 1.31 square miles in size, making Monaco roughly 60% of the size of the world-famous park.

The number of millionaires increased by 12% between 2013 and 2018, according to the 2019 Knight Frank Wealth Report.

Business Insider compared the number of millionaires to the number of residents and calculated that more than 32% of the population are millionaires.

That's higher than some of the most expensive housing markets in the world, such as New York City and Hong Kong. In Hong Kong, the average price pre square foot is $2,859, while in Manhattan, real estate costs an average of $1,773 per square foot, according to NeighborhoodX.

For a small one-bedroom apartment in Monaco, buyers can expect to pay at least $1.6 million, Alexander Kraft, chairman and CEO of Sotheby's International Realty France–Monaco, told Mansion Global.

Most "normal" apartments in the city-state cost between $2.2 million and $22.3 million, Kraft said, with the higher end penthouses going for more than $55 million.

And prices are only going up — they've jumped more than 18% since 2017, according to Bloomberg.

In the seaside Larvotto district, one of Monaco's most populous neighborhoods, the average resale price was more than $16 million.

Monaco claims to be one of the most high-security cities in the world, with a 24-hour video surveillance system that covers the entire town.

The gambling ban for residents leaves all the gambling up to tourists and foreign residents.

Monaco is beat only by Liechtenstein. Tucked in between Switzerland and Austria, the German-speaking principality has a per capita GDP of $166,021, according to United Nations data.

Liechtenstein is about 80 times larger in area than Monaco.

The other three are Liechtenstein, Luxembourg, and Bermuda.

Only about 9,259 of Monaco's 38,300 residents were born there, according to the principality's official statistics.

Monaco's life expectancy edges out that of San Marina (85 years), Hong Kong (85 years), and Japan (84 years), according to World Bank data.

According to the CIA World Factbook, no portion of Monaco's population lives below the poverty line.

In 2008, the Wealth Bulletin, a Dow Jones site, named Avenue Princesse Grace the most expensive street in the world, with an average price of $17,750 per square foot.

The street is still one of the most expensive addresses in Monte Carlo, Monaco's most glamorous neighborhood, Edward de Mallet Morgan, a Knight Frank partner who specializes in the high-end residential real estate market worldwide, recently told Mansion Global.

Avenue Princesse Grace was named after Grace Kelly, the American Hollywood actress who married Prince Rainier III and took the title Princess of Monaco. After her marriage, the princess gave up acting to focus on charitable and cultural endeavors.

She died in a car accident in Monaco at the age of 52, almost 30 years after she became the Princess of Monaco.